File name updates(terrain layers)

Assets/Textures/Terrain/TerrainAutoUpgrade/BeachSand.terrainlayer

 TerrainLayer:
   m_ObjectHideFlags: 0
   m_CorrespondingSourceObject: {fileID: 0}
-  m_PrefabInternal: {fileID: 0}
-  m_Name: layer_BeachSand_basecolorBeachSand_normal(45.000,45.000)(0.000,0.000)(0.000,0.000,0.000),0.000,0.000
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_Name: BeachSand
   m_DiffuseTexture: {fileID: 2800000, guid: b3c2ab157efdd44c79666fe44e45e75e, type: 3}
   m_NormalMapTexture: {fileID: 2800000, guid: b793a644029c648a286a2ebd00e9e848, type: 3}
   m_TileSize: {x: 45, y: 45}

Assets/Textures/Terrain/TerrainAutoUpgrade/BeachSand_wet.terrainlayer

 TerrainLayer:
   m_ObjectHideFlags: 0
   m_CorrespondingSourceObject: {fileID: 0}
-  m_PrefabInternal: {fileID: 0}
-  m_Name: layer_BeachSand_wet_basecolor(40.000,40.000)(0.000,0.000)(0.000,0.000,0.000),0.000,0.000
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_Name: BeachSand_wet
   m_DiffuseTexture: {fileID: 2800000, guid: 9b83018dda05e4cffb3ca62e0d54d252, type: 3}
   m_NormalMapTexture: {fileID: 2800000, guid: 58c621426b0004e43b875f1bfbbbf2d9, type: 3}
   m_TileSize: {x: 40, y: 40}

Assets/Textures/Terrain/TerrainAutoUpgrade/Bush.terrainlayer

 TerrainLayer:
   m_ObjectHideFlags: 0
   m_CorrespondingSourceObject: {fileID: 0}
-  m_PrefabInternal: {fileID: 0}
-  m_Name: layer_BushBush_norm(50.000,50.000)(0.000,0.000)(0.000,0.000,0.000),0.000,0.000
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_Name: Bush
   m_DiffuseTexture: {fileID: 2800000, guid: 3a9b50088d85baf4b9bdb204225d1867, type: 3}
   m_NormalMapTexture: {fileID: 2800000, guid: d32e7607f71a3e6449c16ae86a4f459a, type: 3}
   m_TileSize: {x: 50, y: 50}

Assets/Textures/Terrain/TerrainAutoUpgrade/RockPlants.terrainlayer

 TerrainLayer:
   m_ObjectHideFlags: 0
   m_CorrespondingSourceObject: {fileID: 0}
-  m_PrefabInternal: {fileID: 0}
-  m_Name: layer_RockPlants_basecolorRockPlants_normal(15.000,15.000)(0.000,0.000)(0.000,0.000,0.000),0.000,0.000
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_Name: RockPlants
   m_DiffuseTexture: {fileID: 2800000, guid: bf333e97cb53145b5a2ca8ab996fb5a0, type: 3}
   m_NormalMapTexture: {fileID: 2800000, guid: f46e0b71ea742443091fd73952b2e9c7, type: 3}
   m_TileSize: {x: 15, y: 15}

Assets/Textures/Terrain/TerrainAutoUpgrade/SandRocks.terrainlayer

 TerrainLayer:
   m_ObjectHideFlags: 0
   m_CorrespondingSourceObject: {fileID: 0}
-  m_PrefabInternal: {fileID: 0}
-  m_Name: layer_SandRocks_basecolorSandRocks_normal(33.000,33.000)(0.000,0.000)(0.000,0.000,0.000),0.000,0.000
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_Name: SandRocks
   m_DiffuseTexture: {fileID: 2800000, guid: 36283a22a982c44448b4a62732a0866f, type: 3}
   m_NormalMapTexture: {fileID: 2800000, guid: 9b6c255f1b0f84e4caab0ca53ff3d44a, type: 3}
   m_TileSize: {x: 33, y: 33}